Sonic Racing Transformed is a mobile version (with controls adapted for touch screens) of the racing game of the same name that was released in 2012 for desktop consoles and PCs.
As is to be expected, this free version of Sonic Racing Transformed does not come with all of the characters and tracks unblocked from the very beginning. Instead, you just start with Sonic, and you will have to pay for the rest of the characters if you want to use them.
The pilots that you can use in Sonic Racing Transformed include Ryo Hazuki, from Shenmue; Amigo, from Samba de Amigo; Joe Musashi, from the Shinobi saga; or the Crazy Taxi driver, among many others.
The main new thing that Sonic Racing Transformed offers with respect to the earlier version of the saga is that now the cars can transform in order to adapt to the demands of the racetrack. Your vehicle can go by land, air and sea depending on the situation.
Visually speaking, Sonic Racing Transformed is a show that, logically, is much better if you play it on powerful tablets. In fact, many of the less powerful Android tablets will run into many, many problems running this game.
Sonic Racing Transformed has a number of different game modes that allow you to play both on your own and in multi-player games online.